Montello, WI has a population of 1,503 and is the 12,674th largest city in the United States. The population density is 789 per sq mi which is 802% higher than the Wisconsin average and 771% higher than the national average. The median age in Montello is 44 which is approximately 12% higher than the Wisconsin average of 39. In Montello, 49% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 72% of Montello residents were born in Wisconsin, 27% were born out of state, 0% were born outside of the United States and 1% were foreign born.